【題目】---- When _________ the abacus(算盤) _______?

--- In the sixth century by the Chinese people.

A. is; invented B. did; invent C. was; invented

【答案】C

【解析】句意:---算盤是什么時候被發(fā)明的?---它是在6世紀(jì)被中國人發(fā)明的?疾When引導(dǎo)的特殊疑問句的表示方式。以及被動語態(tài)的用法。be invented表示“被發(fā)明,故選C。

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